package com.base.api.common;

import com.base.core.constant.Constants;
import com.base.core.model.ApiRes;
import com.base.core.utils.Base64;
import com.base.core.utils.BaseException;
import com.base.core.utils.IdUtils;
import com.base.core.utils.RedisCache;
import com.google.code.kaptcha.Producer;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Objects;
import java.util.concurrent.TimeUnit;

/**
 * 验证码操作处理
 * 
 * @author ruoyi
 */
@RestController
public class CaptchaController
{
    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Autowired
    private RedisCache redisCache;

    /**
     * 验证码类型
     */
    @Value("${project.captchaType}")
    private String captchaType;

    private static final String MATH_TYPE = "math";
    private static final String CHAR_TYPE = "char";

    /**
     * 生成验证码
     */
    @GetMapping("/captchaImage")
    public ApiRes getCode(HttpServletResponse response) throws IOException {
        // 保存验证码信息
        String uuid = IdUtils.simpleUUID();
        String verifyKey = Constants.CAPTCHA_CODE_KEY + uuid;

        String capStr = null, code = null;
        BufferedImage image = null;

        // 生成验证码
        if (MATH_TYPE.equals(captchaType)) {
            String capText = captchaProducerMath.createText();
            capStr = capText.substring(0, capText.lastIndexOf("@"));
            code = capText.substring(capText.lastIndexOf("@") + 1);
            image = captchaProducerMath.createImage(capStr);
        } else if (CHAR_TYPE.equals(captchaType)) {
            capStr = code = captchaProducer.createText();
            image = captchaProducer.createImage(capStr);
        }

        redisCache.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpg", os);
        } catch (IOException e) {
            return ApiRes.failed(e.getMessage());
        }

        ApiRes ajax = ApiRes.success();
        ajax.put("uuid", uuid);
        ajax.put("img", Base64.encode(os.toByteArray()));
        return ajax;
    }

    public boolean checkChar(String uuid, String code) {
        String key = Constants.CAPTCHA_CODE_KEY + uuid;
        String captcha = redisCache.getCacheObject(key);
        redisCache.deleteObject(key);
        if (Objects.isNull(captcha)) {
            throw new BaseException("");
        }
        if (!code.equalsIgnoreCase(captcha)) {
            throw new BaseException("");
        }
        return false;
    }
}
